זה אלי

Mekhilta d'Rabbi Yishmael, Massekhta d'Shira, Beshalach, Parashah 3, p. 127:

"This is my God" 

When they saw the Divine revealed at the sea, they didn't have to ask, "Which one is the Ruler?"  As soon as they saw the Divine, they knew.  And they opened up and said, "This is my God."  

They didn't have to ask.  They just knew.  They knew.